Commutated dynamoelectric machine



y 1951 J. c. MAcFARLANE ETAL 2,562,052

coMMUTATBD DYNAMoELEcTRc MAcHINE 5 SheetsSheet 1 Fied July 29 1947 y 1951 J- c. MAcFARLANE ETAL 2,562,052

coTATED DYNAMoELEcTRc MAcHINB Fi1ed ju:Ly 29. 1947 y 19 J. c. MAcFARLANE ETAL 2,562,052

coMMUTATED DYNAMoELEcTRc MAcHINE y 1951 J. c. MAcFARLANE ETAL 2,562,052

coMMUTATED DYNAMOELEcTRIc MAcHINE Filed Jul 29, 1947 5 SheetsSheet 5 fflatufe vvith eLn oppfopfite1y Shoft Span and the ooInponsoting fvinding having one of lT1ofe S1otS blank at the interpo1f aXis. The cof1tfo11ing Winding Inay be Inofe eaSily aooo1T1n1odated in the exiSting s1ots than iT1 the conventional fu11 Span afInotufe nlachine.

The Inachine fnay have any nuInber of poles suitable to deSign fequifeInentS, and aS contro1 1ing curfentS circulate onl in the coilS under going commutation, a11 the afInatL1fe conS be tween the bfuSheS afe USed fof povef olltput. Thus by effeotively vaTying the Xvidth of the bTuShes, the ratio of the oontfo11ing paft of the arnlature to the outpnt paft may be altefed. The contro1 WindingS, coffeotly pfopoftioned to the output windings, yie1d a nchine of little over norfna1 Size.

In the pfesent invention circulating c11rentS aTe induced in the Shoft cirouifed ooilS to effeot ohange of f1ux So that they cause father than result in ux change.

n1ost conduotofS of the pole Winding ShoTt of the commutating oxis b a Sufoient numbef of slotS to give Suitab1y Wide intefpo1f Spaoe for oon1 1nutation, that iS the outeInost cond uctors span less than 180 degfees.

cornpensating winding iS at fight ang1es and connected in Sefies With the aflnature oifouit- It haS its outefInost conduotofS affanged in s1otS near the ITagnetiZing axiS, thot iS, oovefing ap pfoxifnately the fu11 span oetWeen centfeS of the fnain poles, and itS inneffnoSt oonductofs are Wound in adjacent S1otS on the commntating ax1s. The arInatufe haS Shoftef ooi1 span than usual to give a n1. Tn. f. charactefiStic of tfiangulaf Shape, vvith the apex cot off. The tefIn Shoft Span, and the type fI1. 1 n. f chafaotefistio obtained thereby, fe weH known in the aft- In order that our invention nlay be pfopefly undefstood we append hefewith by Way of exam p1e, explanato1'y draWingS Wheref 1:

'ig. 1 showS the diagfam, developed out f1at, of affnature In. n1. f. feSulting ffofn the Short ened Span of the arxnatufe coilS and the peaked n1. n1. f chafaotefistic of an appfopriate fle1d Winding.

ohafaotefiStic of the coInpenSating vvinding f1aJt tened owing to the centfe tofnS of the oolT1pen sating vvinding Spanning one Slot, The conlpensoting vinding ba1ances the affnatufe Winding aJt a11positions aXvay ffon^ the con1fnutating Space.

f ig. 3 showS the diStfibLItion of ourfent in the ofInatufe conduotofS fesu1ting ffoIn the shoft Span vvinding, With ooInpenSating ooi1 Wound to the centre, as for Fig- 1.

i 1 ShowS the diStfibution of oufrent in ar- Inature and coInpensating WindingS as in 1 ig 3, bu With the coInpenSating Winding Spannin one Slo Fig. 5 is a diagrammatic view of a 2 pole dy namo machine of the type deScribed and adapted for the Inodi11ed fofxn of the invention thiS, 11ovv ever, being typioa1 also for a nlulti-pole Inaohine.

Fig. 6 ShovvS the vafiouS types of Winding vhioh nlaJy be uSed on the nlachine- Fig. 7 shOWS an rrangenent in which an in jector ffanSforInef feeds the contfo11ing coi1.

In Fig. 8, the pfoviSion of Sepafate contfoHing coils iS avoided by divefSion of paft of the fnain cuffent pajst the oofnpenSating Winding thfo gh an induotive diveftof.

The deSifeo oonventiona1 vvindingS on the znagnetising aXiS have the outer In Fig. 9 a diveftof is alSo uti1iSed but in th1s caSe it iS a non-inductive TeSistonce.

In ig. 10 the oontroHing ooil conSiStS of a Shading coiL In Fig, 11 tWo opposing oontfo1 coi1s are used, one acting oS an abutnlent againSt the othe1'.

1f ig. 12 iS a fnodioation of 1 ig. 11 in vvhioh tWo opposing oontrol coilS afe in Sefies, but one actS aS an aftificia1 abutment coil by shunting a non-1inear cefafnic reSistanoe thefeon.

1 ig. 13 shovvS aJ Inodioation of ig. 12, in vvhich aJn artif1oi1 but1nent ooi1 iS pfovided as aJ bfidge oifouit.

f,ig, 1 Shows an arfangenlent in which the oontro1 Winding haS in Sefies thefevvith a second winding on the nain poles of the n1achine.

1 'igS. 15, 16, 17 afe diagfafnS 111I1stfalting fnodi f1oations of the invention as applied to ooseS Where continL1ous of nOntfansient contro1 is Te quired.

1 'ig. 18 iS a diagfan1 of a fuftheT n1odincotion v Where continuous or non-tTanSient contro1 is re quired- In conSidering the ohafaotefiStioS Shovn in F1g. 1 and Pig. 2, it Shoo1d be oleafly Understood thot theSe V-Shaped figufes with Stfaight s1des o e oI1ly obtainab1e With Windings diStfibuted oon tinuously ovef a S1T1ooth cofe. vvith a toothed oofe the m. n1. f. charaotofiStios vvi11 have stepped ohafaoteriSticS, the n1. n1. f. inoreaSing of de ofeaSing Step by step as the Winding StepS ffon1 Slot to s1ot, but since in any oaSe the slot leakoge vvi11 tend to SIT1ooth out the steps of aotua1 flux feSu1ting ffon1 the Stepped 1n, n. f,, thefe Wi11 be no appreoiable error in aSSuIningthat the v- Shaped choractefiSticS have stfaJight sideS, os ShoWn in theS diaugfaIns. vve therefofe, fof Sim plicity, shov t11e chafactefiSticS a Stfaight Sided V,S with 01' vvithout f1attened tOps.

n a oofnpenSted fnachine With laIninated ffe1d StrLIcture aS ofdinary deSigned, the o ITlature and cofnpensating oharaotefiStio vvi11 be hofp pointed V direotly oppoSing ono nothef but with tho oddition of a frthef m m. f. on tho tooth or teeth Surrounded by the addifiono1 io terpole ampere turnS. This oonstfuotion brif1gs about the diSadvantages 1read e lu11erated.

In our invention vve avoid the neoeSSity fof pfoviding theso additiona1intefpole oInpee tufns by W1nding the aTmoture of shofter Span thon normaL thereby cutting off the peak of af nofure m n1, f. at the interpolar afe While fetaining the fu11 ooInpenSating coil aS hefein more funy described. This feSu1tS iI1 the m. m f of the oom pensoting ooi1being in exceSS on the oofnInutating axis by on anount just Suioie11t fo give the neceSSafy anlpere turnS for oofnInutotion.

Referring to Fig. 1, the heavy 1ine oharooter tiSed 2-4- -7 B is he rmture m. m. f. of an armatnfe with Shoft Spon oonS, Whne the ohain dotted ohafactefiStio o1 l2 is the ohafacteriStic of the conpenSating vViflding, Jbo1 ancing out the arInatufe fn. n1. f. at a11 points exoept at the neutfal zone whefe it exceodS the m. m-f, of the arInature Winding, as shown by the line l5l6 fof instance, Whioh i,S the arIn a tufe fT1, In. f. 45 pfojected over to Sho the greater In. In. f. of the co1npenSating WiI1ding at ooint l l. In other Wofds, the difference E. M. 1 shown by point 1 1 and bhe line l5E, repfesent ing the arfnatufe In In. f. iS the n1. n1. fvanab1e for oofnnlutation.

The chafaoteriStioS of 1 ,ig. 1 vvo111d be suitable for a machine with nxed brush poSitions- 13 in tu1n alteTS the f111x in the 1nain e1d axis of the machine in 1es onSe to said variationS- 8. 1 1 dynaIno eleotric n12chine acooTding to olai111 7, 1n Whioh Said feed back 1neans i11o111de 2 tranSfo11ner oonneoted 011 the prin1a1y Side to saiid contro1 oirouit, and 211 ancillary inte1 ole ooi1 oonneoted to the Secondary Side of Said tTanS former.

9. 11 dynan1o eleotTio nlachine aooo1ding to o19i1n 7, inoluding two a11oi1191y inteTpole coilS, neanS 101 feeding Said variations in current to one of said interpole ooilS, and Ine3ns for feeding a our1ent of very 1n11oh sIna11er variation to the other of Said interpole coi1S.

JAS. c. MACARLAN vvILL1AM IAN 1/1ACFARLANB.

BEEEBENcES cITED The following 1eferenoes 9re of reoord i11 the 11le of this pa,tent= Numbe 1,215,786 1,287,19o 1,15 1,925 1,595,'737 1,63o,399 1719905 1,756,867 2,166,137 2,283,o8 2,310,131 2,32 1,319 2, 127,571

. 14 UNITED STATS PATBNTs 1TaIne Date ah11nbaoher E eb. 13, 191? BergInan Deo. 10, 1918 Hellmund May 15, 1923 Shand Aug. 10, 1926 Krauss May 31, 1927 Schombouge1 Jul 9, 1929 Konn A T- 29, 1930 Stivender July 18, 1939 Lane JI111e 30, 192 Tominger Feb, 2, 19 13 Page July 13, 1943 P11111ipS Se t. 16, 197 Merri11 se t. 27, 1949 

